package com.lagou.handler;

import com.lagou.pojo.RpcRequest;
import com.lagou.service.IUserService;
import com.lagou.service.UserServiceImpl;
import io.netty.channel.ChannelHandler;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.ChannelInboundHandlerAdapter;
import io.netty.util.concurrent.EventExecutorGroup;

import java.lang.reflect.Method;

/**
 * 自定义的业务处理器
 */
public class UserServiceHandler extends ChannelInboundHandlerAdapter {
    private IUserService userService  = new UserServiceImpl();
    //当客户端读取数据时,该方法会被调用
    @Override
    public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception {
        RpcRequest request = (RpcRequest) msg;
        //通过反射，动态代理等技术，最终能够执行目标方法
        if(!request.getClassName().equals(userService.getClass().getInterfaces()[0].getName())){
            return;
        }
        Method method = userService.getClass().getDeclaredMethod(request.getMethodName(), request.getParameterTypes());
        if(method==null){
            return;
        }
        Object result = method.invoke(userService, request.getParameters());
        request.setParameters(new Object[]{result});
        ctx.writeAndFlush(request);





//        //注意:  客户端将来发送请求的时候会传递一个参数:  UserService#sayHello#are you ok
//         //1.判断当前的请求是否符合规则
//        if(msg.toString().startsWith("UserService")){
//            //2.如果符合规则,调用实现类货到一个result
//            UserServiceImpl service = new UserServiceImpl();
//            String result = service.sayHello(msg.toString().substring(msg.toString().lastIndexOf("#")+1));
//            //3.把调用实现类的方法获得的结果写到客户端
//            ctx.writeAndFlush(result);
//        }


    }
}
